GB341083A - Improvements in and relating to processes for decolorising phenol-formaldehyde artificial resins condensed by means of ammonia - Google Patents
Improvements in and relating to processes for decolorising phenol-formaldehyde artificial resins condensed by means of ammoniaInfo
- Publication number
- GB341083A GB341083A GB3062129A GB3062129A GB341083A GB 341083 A GB341083 A GB 341083A GB 3062129 A GB3062129 A GB 3062129A GB 3062129 A GB3062129 A GB 3062129A GB 341083 A GB341083 A GB 341083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- until
- ammonia
- phenol
- dithiocarbamate
- formaldehyde
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G14/00—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00
- C08G14/02—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes
- C08G14/04—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols
- C08G14/06—Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 of aldehydes with phenols and monomers containing hydrogen attached to nitrogen
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Phenol-formaldehyde condensation products when made by using ammonia as the condensing agent are obtained as colourless products by the use of dithiocarbamates of strong bases added either before or after the condensation, the resin formed by the condensation being evaporated until it breaks under water. According to the examples (1) 8 kilos of phenol, 9 kilos of formaldehyde (30 per cent solution), 120 c.c.m. of ammonia (0,91), and 40 grm. piperidine pentamethylene-dithiocarbamate are condensed until the mixture turns cloudy and then for 15 minutes longer; the mixture is then freed from water in a vacuum, until a specimen of the resin breaks under water at room temperature. The product is colourless. (2) 1 kilo of phenol and 1 kilo of formaldehyde are condensed with 15 c.c.m. of ammonia (0,91) until the resin separates out; the resin is then removed and heated. When the temperature reaches 120 DEG C. 5 grm. of piperidine pentamethylene-dithiocarbamate are added and the whole further freed from water until a specimen snaps under water. When adding the thiocarbamate the mixture must be heated only very gently since a rapid reaction causes frothing. The use of dimethylamine dimethyldithio-carbamate and diethylamine diethyl-dithiocarbamate is also referred to. Commercial piperidine pentamethylene-dithiocarbamate must be purified by repeated recrystalization prior to use, since it contains iron impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3062129A GB341083A (en) | 1929-10-09 | 1929-10-09 | Improvements in and relating to processes for decolorising phenol-formaldehyde artificial resins condensed by means of ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3062129A GB341083A (en) | 1929-10-09 | 1929-10-09 | Improvements in and relating to processes for decolorising phenol-formaldehyde artificial resins condensed by means of ammonia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB341083A true GB341083A (en) | 1931-01-09 |
Family
ID=10310515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3062129A Expired GB341083A (en) | 1929-10-09 | 1929-10-09 | Improvements in and relating to processes for decolorising phenol-formaldehyde artificial resins condensed by means of ammonia |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB341083A (en) |
-
1929
- 1929-10-09 GB GB3062129A patent/GB341083A/en not_active Expired
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